I have used the PLUGPDF as a third party library ,to open the PDF files in my application by passing the filepath in SimpleDocumentReader class constructor, but when i navigate page very fastly using bottom scrollbar then first it loading that page but after loading that page , it hangs, and we have to reopen the pdf file .

Thank you for inquiry.
Could you let me know your version of PlugPDF?
Actually in latest version, we fixed a problem that page is hanged.
this is download link of newest version of PlugPDF.https://plugpdf.com/sdkfile/PlugPDF_Android.zip

But if you used the latest version, Could you explain your situation in more detail?
Actually with a video or image files for easy to understand, It would be very helpful clue to solve that problem.

Thank you so much for quick reply, i have 2.5.96 Planned Update, June 3, 2015 , plupdf library , so i think need to update my library first , which you provided , may be this will resolve my issue , because as per Release note content of provided src code , loading performance is increased , so may be this will help me.